In a statement, the bank said, "Customers are currently unable to access accounts and the posting of transactions has been impacted due to a processing delay. Our technical teams are fully engaged on this issue. We apologize for any inconvenience."

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By 8:30 a.m. Eastern time, some customers could log in to their accounts, but a message on the website said, "Due to extended system maintenance, account balances are reflecting prior day balances."

Three hours later, the bank said the processing delay was resolved and all transactions were posted. The were still issues affecting mobile and online banking, the statement said.

Citizens is primarily located in the northeastern U.S., with some branches in the Midwest and south.